Hammer toe

A Patient’s Guide to Claw Toes and Hammer toes

Introduction

Claw toe and hammer toe conditions are fairly common in cultures that wear shoes. In most cases, these problems can be traced directly to ill-fitting shoes.

This guide will help you understand

• how claw toe and hammer toe conditions develop
• how the conditions cause problems
• what treatment options are available

Anatomy

What part of the toe is affected?

The forefoot and toes are made up of several bones. Each of the four smaller toes starts with a metatarsal bone within the forefoot. Moving down the foot from the metatarsal bone are three smaller bones, called phalanges. The first of these small bones is called the proximal phalanx. (Proximal means closer.) Next comes the middle phalanx, and last is the distal phalanx. (Distal means further away.)

The toe bones connect to form the toe joints. The metatarsophalangeal joint (or MTP joint) is the first joint that connects the toe to the foot. The ball of the foot is formed by the MTP joints. The second joint is the proximal interphalangeal joint (or PIP joint), and the last is the distal interphalangeal joint (or DIP joint). Each joint is surrounded by a joint capsule made of ligaments that hold the bones together. Two tendons run along the bottom of each toe that allow us to curl our toes, and one tendon runs along the top that raises the toe.

In a hammer toe deformity, the first joint (MTP) is cocked upward, and the middle joint (PIP) bends downward. A claw toe deformity has a cocked up MTP joint, and both the middle joint (PIP) and the tiny joint at the end of the toe (the DIP) are curled downward like a claw.

Related Document: A Patient’s Guide to Foot Anatomy

Causes

Why do I have this problem?

Both of these problems can be the result of wearing a shoe that is too short. In many people, the second toe is actually longer than the big toe, and if shoes are sized to fit the big toe, the second and maybe even the third toe will have to bend to fit into the shoe. Shoes that are pointed make matters even worse. Combine pointed shoes with high heels, and the foot is constantly being pushed downhill into a wall with the toes squished like an accordion.

A hammer toe in the second toe is also common in people who have a bunion in the big toe. The big toe angles too far toward the middle of the foot, and the second toe can end up with a hammer toe deformity.

Related Document: A Patient’s Guide to Bunions

Claw toes are common in people with high arches. And they can come from a muscle imbalance in which the deeper (intrinsic) toe muscles are weaker than the surface (extrinsic) muscles of the toes. This type of muscle imbalance can occur from more serious nerve problems.

Symptoms

What does the condition feel like?

Eventually, toes that are squished day after day become fixed in that position and will not straighten out. When this occurs, pressure builds in three places:

• at the end of the toe
• over the PIP joint
• under the MTP joint

Painful calluses develop as a result of pressure from the shoe.

Diagnosis

How do doctors identify the condition?

Diagnosis of these two conditions is usually obvious from the physical exam. In some cases, it is important to check to make sure no other nerve problems are to blame for the condition, particularly when claw toes are present. Other special tests may be required.

Treatment

What can be done for the problem?

Nonsurgical Treatment

Treatment depends on how far along the process is. Early on, simply switching to shoes that fit properly may stop the deformity and return the toes to a more normal condition. If the condition is more advanced and the toes will not completely straighten out on their own, a contracture may exist. A contracture occurs when scar tissue tightens a joint and keeps it from moving through its normal range of motion.

Pressure points and calluses caused by a contracture can be treated by switching to shoes that have more room in the toe or by placing pads over the calluses to relieve the pressure.

Surgery

If all else fails, surgery may be suggested to correct the alignment of the toe. The main type of procedure performed for these conditions is referred to as an arthroplasty. Arthroplasty is the reconstruction or replacement of a joint.

DIP Joint Arthroplasty

For the hammer toe deformity, an arthroplasty of the DIP joint may be suggested. This procedure is performed through a small incision in the top of the toe over the DIP joint. Once the joint is entered, an arthroplasty is performed by removing one side of the joint. This releases the tension on the ligaments and tendons around the joint and allows the toe to be realigned in the proper position. Once the toe is in the proper position, it is held with sutures (stitches) or a metal pin while it heals.

PIP Joint Arthroplasty

One of the most common procedures to correct the claw toe deformity is an arthroplasty of the PIP joint. In this procedure an incision is made over the joint. Once the surgeon can see the joint, the end of the proximal phalanx is removed to shorten the toe and relax the contracture around the joint. The toe is then either held with metal pins or sutures in the straight position until it heals.

As the joint heals, scar tissue forms, connecting the two bones together and replacing the area where the joint once was. Surgeons refer to this as a false joint (or pseudo joint) because the scar tissue allows a bit of motion to occur between the two bones while keeping them from rubbing together and causing pain.

MTP Joint Release

If clawing is a problem, then the MTP joint may also have to be released to relieve the contracture of this joint and allow the proximal phalanx to come into the correct position. This procedure is performed by making an incision on the top of the toe over the MTP joint. The surgeon then releases the tight ligaments and tendons until the toe easily moves back into the proper alignment. The toe may be held in the proper alignment with a metal pin until the soft tissues heal. The pin may remain in place for three or four weeks.

Rehabilitation

What should I expect after treatment?

Nonsurgical Rehabilitation

Patients with hammer toe or claw toe deformities may benefit from four to six physical therapy treatments. Your therapist can design a pair of shoe insoles or orthotics to correct associated problems, such as high arches. Recommendations may be given of shoes that have extra depth in the forefoot. The added depth gives the toes room so that bony areas won’t rub inside your shoes. Therapists apply small cushions over callused or irritated areas of the toes.

A series of stretching and strengthening exercises may be designed to improve muscle balance between the deep (intrinsic) toe muscles and the surface (extrinsic) muscles of the toe.

After Surgery

Patients are usually fitted with a post-op shoe. This shoe has a stiff, wooden sole that protects the toes by keeping the foot from bending. Any pins are usually removed after the bone begins to mend (usually two to four weeks).

You will probably wear a bandage or dressing for about a week following the procedure. The stitches are generally removed in 10 to 14 days. However, if your surgeon chose to use sutures that dissolve, you won’t need to have the stitches taken out.